Color code
Over the years, several coding methods have been used by manufacturers to describe the values of the parts. Some of them use letters, numbers, or both letters and numbers and some use color code. The most common and most used methods are described bellow
Resistor Color Code Table.
| Color | Digit | Tolerance | |
|---|---|---|---|
| Black | 0 | 1 | |
| Brown | 1 | 10 | ± 1% |
| Red | 2 | 100 | ± 2% |
| Orange | 3 | 1,000 | |
| Yellow | 4 | 10,000 | |
| Green | 5 | 100,000 | ± 0.5% |
| Blue | 6 | 1,000,000 | ± 0.25% |
| Violet | 7 | 10,000,000 | ± 0.1% |
| Grey | 8 | ||
| White | 9 | ||
| Gold | 0.1 | ± 5% | |
| Silver | 0.01 | ± 10% | |
| None | ± 20% |
How to calculate resistance value:
 |
| Fig. 1 |
Five band resistor color code
a) 1st Band,2nd band,and 3rd band is digit value.See Fig.1 and 4th band color is multiplier.
b) 5th band is tolerance.
In the Fig. 1 1st color of resistor is orange,2nd color orange and 3rd color is white and 4th band multiplier color is black so total value of resistor is 339*1=339 ohms
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